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Silolyl Anions and Silole Dianions: Structure of [K([18]crown‐6) + ] 2 [C 4 Me 4 Si 2− ]
Author(s) -
Freeman William P.,
Tilley T. Don,
Yap Glenn P. A.,
Rheingold Arnold L.
Publication year - 1996
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199608821
Subject(s) - delocalized electron , crystallography , chemistry , ring (chemistry) , salt (chemistry) , crystal structure , potassium , organic chemistry
Nearly equivalent CC distances in the five‐membered ring of the dianion C 4 Me 4 Si 2− , which could be isolated in crystalline form as a potassium salt in the presence of [18]crown‐6 (structure on the right), suggest a high degree of delocalization. In contrast, 29 Si and 13 C NMR spectroscopic investigations of the silolyl anions C 4 Me 4 SiR − (R SiMe 3 , Si(SiMe 3 )C 4 Me 4 ) show that delocalization in these systems is minimal.